1 //===-- Unittests for Limits ----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "src/__support/CPP/Limits.h"
10 #include "utils/UnitTest/Test.h"
11 
12 // This just checks against the C spec, almost all implementations will surpass
13 // this.
14 TEST(LlvmLibcLimitsTest, LimitsFollowSpec) {
15   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<int>::max(), INT_MAX);
16   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<int>::min(), INT_MIN);
17 
18   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<unsigned int>::max(), UINT_MAX);
19 
20   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long>::max(), LONG_MAX);
21   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long>::min(), LONG_MIN);
22 
23   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<unsigned long>::max(), ULONG_MAX);
24 
25   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long long>::max(), LLONG_MAX);
26   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long long>::min(), LLONG_MIN);
27 
28   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<unsigned long long>::max(),
29             ULLONG_MAX);
30 }
31 
32 #ifdef __SIZEOF_INT128__
33 // This checks that the current environment supports 128 bit integers.
34 TEST(LlvmLibcLimitsTest, Int128Works) {
35   __int128_t max128 = ~__uint128_t(0) >> 1;
36   __int128_t min128 = (__int128_t(1) << 127);
37   EXPECT_GT(__llvm_libc::cpp::NumericLimits<__int128_t>::max(),
38             __int128_t(__llvm_libc::cpp::NumericLimits<long long>::max()));
39   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<__int128_t>::max(), max128);
40 
41   EXPECT_LT(__llvm_libc::cpp::NumericLimits<__int128_t>::min(),
42             __int128_t(__llvm_libc::cpp::NumericLimits<long long>::min()));
43   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<__int128_t>::min(), min128);
44 
45   __uint128_t umax128 = ~__uint128_t(0);
46   EXPECT_GT(
47       __llvm_libc::cpp::NumericLimits<__uint128_t>::max(),
48       __uint128_t(__llvm_libc::cpp::NumericLimits<unsigned long long>::max()));
49   ASSERT_EQ(__llvm_libc::cpp::NumericLimits<__uint128_t>::max(), umax128);
50 }
51 #endif
52